Cecidomyia stebbinsae

Cecidomyia irregularis

Cecidomyiidae

Harmandiola

Populus grandidentata

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Harmandiola stebbinsae

Cecidomyia? irregularis, n. s.

Irregular, monothalamous, blister-galls, between veins. Usually more than one on a leaf. Projecting above mainly, presence indicated below by a light-colored, roughened space. On large-toothed aspen, Populus grandidentata. Not rare.

Insect galls of Springfield, Massachusetts, and vicinity

Cecidomyia irregularis Steb

Irregular one-celled, blister galls, mostly on upper surface, light colored, on large-toothed poplar, midge

Plant Galls and Gall Makers

Harmandiola stebbinsae NEW NAME

A North American species, Cecidomyia irregularis Stebbins (1910), is preoccupied by C. irregularis Bremi and is here renamed Cecidoinyia stebbinsae Gagne. NEW NAME.

New synonymy and homonymy in Cecidomyiidae (Diptera)

Harmandia stebbinsae

Host: Populus grandidentata

Harmandia galls are monothalamous and yellow, green, or reddish. In late spring or summer full-grown larvae drop to the ground to overwinter. Various other cecidomyiids have also been reared from these galls. These include a Clinodiplosis sp., Mycodiplosis thoracica, and Rhizomyia absobrina, all presumably mycophages.

The gall is a blister, convex and reddish on the upper surface of the leaf, flat and light green below, occurring between or on veins.

Range: MA and MD

The plant-feeding gall midges of North America

Descriptions of the gall induced by Harmandiola stebbinsae are contradictory. The original Stebbins description states the gall is found "above mainly, presence indicated below by a light-colored, roughened space", suggested something most similar to our [p-tremuloides-like-globuli](https://www.gallformers.org/gall/4033). However, Gagne 1989's drawing shows the species to induce a concentric circular gall similar to [p-balsamifera-leaf-gall](https://www.gallformers.org/gall/3987), though it seems unlikely that Gagne would not note that this was an exposed-larva gall if it were. Adding to the confusion is the fact that no observations on iNat that match either description have been reported from the type host, Populus grandidentata. 

Gallformers ID Notes